There are many causes for the symptoms you describe. They may or may not be related to your head injury
. You need to have certain blood and investigative tests done. An MRI of the brain to rule out any lesion in the pituitary is important. A visual field
analysis to see if there is any defective vision is just as needed. Get a blood workup that will check for the thyroid
levels as well as the hormones of the pituitary gland
like ACTH, cortisol
and TSH. Try and get these done early to localise your cause and treatment can be started early to improve your problem.